Check all the data lines, the test connection near the parking brake (it's a small plastic cover with a metal connector that continues the data circuit), the 7 volt power supply above the gas pedal is a possible culprit, the BCM (body control module) and any part in between that involves the data line with includes the climate control, chime control module etc. The data circuit is a redundant circuit and in general it has to be shorted to ground or both sides open for it to have that type of effect on the cluster. In most cases it's the cluster itself unfortunately. The way it was designed, the parts that are surface soldered just lift off and you have problems from vibration and weather changes that cause this.
I had mine fixed by mrwizzard.com I had to remove it and send it in. cost was about 100 dollars in 2003 for 1991 trofeo dash cluster.
check your fuses. it is most likely the fuse that goes to your electronic digital dash.
dash dash
If there is no light at all in whole dash. first check the fuse second check the headlight control switch.
Be sure the dash light dimmer switch is not turned off.
check dimmer switch on dash very easy to forget . Could be light bad if dash stillworks
Check the fuses.
First check the dash light dimmer control switch to be sure it is not turned off then check the fuse.
The speakers in a 1985 Toronado are a pair of 4x6" in the dash up front, and a pair of 4x10" in the rear, under the package shelf (access through the trunk).
If you dash lights are not working check that your parking/brake lights are working also check fuses for cig lighter and interior lights that may help get the dash light working again.
check the oil maybe?
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